Method for producing heterophasic propylene polymer material

Patent metadata

Field	Value
Publication number	US-10815319-B2
Application number	US-201716320783-A
Country	US
Kind code	B2
Filing date	Aug 1, 2017
Priority date	Aug 3, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Step (2): a step of copolymerizing at least one olefin selected from the group consisting of ethylene and α-olefins having the number of carbon atoms of 4 or more and 12 or less, and propylene in the presence of the propylene homopolymer (I-1) or the propylene copolymer (I-2) obtained in the step (1), using 1 or more gas phase polymerization reactors, to produce a propylene copolymer (II), wherein the concentration of alkanes having the number of carbon atoms of 6 or more in the final gas phase polymerization reactor of the 1 or more gas phase polymerization reactors is 0.01% by volume or more and 0.6% by volume or less.

First claim

The invention claimed is:

1. A production method of the following heterophasic propylene polymerization material comprising a propylene homopolymer (I-1) or a propylene copolymer (I-2), and a propylene copolymer (II), the production method comprising the following step (1) and the following step (2):
step (1): a step of polymerizing a monomer containing propylene in the presence of a catalyst for propylene polymerization to produce a propylene homopolymer (I-1) or a propylene copolymer (I-2), the step satisfying the following formula (A):
1100≤α(1.34β) 1/3   (A)

wherein, in the formula (A),
α represents a median diameter (unit: μm) of the catalyst for propylene polymerization,
β represents a production amount (unit: g/g) of the propylene homopolymer (I-1) or the propylene copolymer (I-2) per 1 g of the catalyst for propylene polymerization in the step (1);
step (2): a step of copolymerizing at least one olefin selected from the group consisting of ethylene and α-olefins having a number of carbon atoms of 4 or more and 12 or less, and propylene in the presence of the propylene homopolymer (I-1) or the propylene copolymer (I-2) obtained in the step (1), using one or more gas phase polymerization reactors, to produce a propylene copolymer (II), wherein
a concentration of alkanes having a number of carbon atoms of 6 or more in the final gas phase polymerization reactor of the one or more gas phase polymerization reactors is 0.01% by volume or more and 0.6% by volume or less;
wherein the heterophasic propylene polymerization material is a heterophasic propylene polymerization material comprises a propylene homopolymer (I-1) or the following propylene copolymer (I-2), and the following propylene copolymer (II), wherein
a content of the propylene copolymer (II) is 30% by weight or more, based on a total weight of the heterophasic propylene polymerization material taken as 100% by weight;
propylene copolymer (I-2) is a propylene copolymer containing a monomer unit derived from propylene and a monomer unit derived from at least one olefin selected from the group consisting of ethylene and α-olefins having a number of carbon atoms of 4 or more and 12 or less, wherein
a content of the monomer unit derived from at least one olefin selected from the group consisting of ethylene and α-olefins having a number of carbon atoms of 4 or more and 12 or less is 0.01% by weight or more and less than 15% by weight, based on a total weight of the propylene copolymer (I-2) taken as 100% by weight;
propylene copolymer (II) is a propylene copolymer containing a monomer unit derived from at least one olefin selected from the group consisting of ethylene and α-olefins having a number of carbon atoms of 4 or more and 12 or less and a monomer unit derived from propylene, wherein
a content of the monomer unit derived from at least one olefin selected from the group consisting of ethylene and α-olefins having a number of carbon atoms of 4 or more and 12 or less is 15% by weight or more and 80% by weight or less, based on a total weight of the propylene copolymer (II) a taken as 100% by weight.

2. The production method of the heterophasic propylene polymerization material according to claim 1 , wherein a concentration of alkanes having 6 carbon atoms in the final gas phase polymerization reactor in the step (2) is 0.01% by volume or more and 0.3% by volume or less.

3. The production method of the heterophasic propylene polymerization material according to claim 1 , wherein the content of the propylene copolymer (II) in the heterophasic propylene polymerization material is 40% by weight or more.

Assignees

• Sumitomo Chemical Co

Inventors

• Arakawa Masayuki
• Itoguchi Satoshi
• Yoshimura Naoto

Classifications

• C08F210/06

  Propene · CPC title

• C08F110/06 Primary

  Propene · CPC title

• C08L23/12

  Polypropene · CPC title

• C08F2/34

  Polymerisation in gaseous state · CPC title

• C08F2/001

  Multistage polymerisation processes characterised by a change in reactor conditions without deactivating the intermediate polymer (C08F295/00, C08F297/00 take precedence) · CPC title